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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Apr. 30, 2015
Apr. 26, 2007
Stock Option [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares, Granted 0 0      
Option expiry term (Years) 10 years        
Stock-based compensation expense $ 1,000 $ 3,000      
Expected additional expense for 2017 $ 1,000        
Weighted-average recognition period of nonvested stock options expense 3 months        
Weighted average remaining life for outstanding stock 3 years 1 month 28 days        
Exercise price range, lower range limit $ 1.20        
Exercise price range, upper range limit $ 5.89        
Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 271,000 215,000      
Expected additional expense for 2017 $ 570,000        
Nonvested shares 320,502   341,184    
Vested shares during 2017 67,212        
Vested shares during 2018 115,508        
Vested shares during 2019 105,109        
Vested shares during 2020 32,673        
Expected additional expense for 2018 $ 550,000        
Expected additional expense for 2019 272,000        
Expected additional expense for 2020 $ 74,000        
Total average per share fair value of shares vested $ 8.63        
2015 Long Term Incentive Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum       1,200,000  
2007 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum         2,000,000
1999 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum 3,569,766        
Annual Incentive Plan [Member] | Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 76,000 76,000      
Annual Incentive Plan [Member] | Restricted Stock [Member] | Beginning on first anniversary of issue date [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation vesting period 3 years        
Annual Incentive Plan [Member] | Cash Portion [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 496,000 325,000      
Long Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 152,000 $ 96,000